* add c++ compability in cli * add sd-filesystem cli commands * add sd-card-test cli commands * use context pointer
* Core: ring buffer. * Api: usb vcp. F3: vcp glue code. * Applications: cli draft version. * Cli: basic working version, includes help and version commands * HAL: vcp on f2 * Makefile: update openocd conf * F3: vcp rx with freertos stream * Cli: help * Cli: standard commands, api-hal-uid * Power: cli poweroff.